Trees and Shrubs: Selection

Selecting trees and shrubs to become mature, healthy, woody plants begins with finding plants suited for their site. Factors such as climate, soil, light, and residential conditions all influence a plant's ability to grow and/or tolerate its environment. Selecting the right plant for the right site and conditions is essential if you want your plant purchases to pay off for years to come.

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Right Plant, Right Place

Pagoda dogwood, Cornus alternifolia, is a small tree that does best in cool, moist soils and is hardy in Zones 3-7. (Photo credit: Karen Jeannette)

Selecting trees and shrubs to become mature, healthy, woody plants begins with finding plants suited for their site. Factors such as climate, soil, light, and residential conditions all influence a plant's ability to grow and/or tolerate its environment. Selecting the right plant for the right site and conditions is essential if you want your plant purchases to pay off for years to come.

Climate

USDA hardiness zone map.

Climate has a large role to play in a plant's ability to survive and thrive. A woody plant that is unable to overwinter or survive the heat of summer, year after year, limits its usefulness to us in the landscape.

Hardiness Zones

Hardiness zones are useful for selecting plants based on their ability to overwinter at a particular average minimum temperature. The National Arboretum is quick to point out that stress factors, new plant management systems, and artificial environments often affect a plant's survivability, too.

Heat Zones

Heat zones show the average number of days each year that a given region experiences "heat days," or temperatures over 86 degrees F. Learn more about heat stress and how it affects plants by reading:

The AHS Plant Heat Zone Map (American Horticultural Society). Notice that factors other than heat can apply stress to plants and skew the heat zone rating. The AHS Plant Heat-Zone ratings assume that adequate water is supplied to the roots of the plant at all times.

Buying Trees and Shrubs

Nursery stock sold in containers. (Photo credit: Karen Jeannette)

Once you've come up with a list of suitable plants for your site, select high-quality plants so you can enjoy the beauty and longevity that healthy plants bring. Purchasing a sickly tree or shrub in hopes of saving it often leads to disappointment. So, how do you know what a high-quality plant looks like?

When you get to the nursery or garden center, woody plants are sold in different ways.

Review:

Ways to Buy Trees and Shrubs, which describes the different ways trees and shrubs are sold or packaged: bare-root, container, b & b, and tree-spade. The packaging affects planting and care for these plants at planting time, so it's important to select the best method of packaging trees and shrubs for your situation.

After carefully selecting trees and shrubs and deciding which plants to buy and how you are going to by them, you'll be ready for planting.